HW5-使用pointer的方式直接access兩張影像中pixel的數值

// Insert a logo into an image



mergeImg=cvCloneImage(pImg);
for (int y=0; yheight; y++) {
uchar* ptr1=(uchar*) (logoImg->imageData +y*logoImg->widthStep);
uchar* ptr2=(uchar*) (mergeImg->imageData +(y+y1)*mergeImg->widthStep);
for (int x=0; xwidth; x++) {
ptr2[3*(x+x1)]=alpha*ptr1[3*(x)] + (1-alpha)*ptr2[3*(x+x1)];
ptr2[3*(x+x1)+1]=alpha*ptr1[3*(x)+1] + (1-alpha)*ptr2[3*(x+x1)+1];
ptr2[3*(x+x1)+2]=alpha*ptr1[3*(x)+2] + (1-alpha)*ptr2[3*(x+x1)+2];
}
}